Coffee-pot.



. PTENTBD 110V. 19, 1907.

J. S. DUNLAP.

COFFEE POT.

APPLIOATIOH FILED 11111.14. 1907.

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A TTORNE ys PATNTED NOV. 19, 1907.

J. S. DUNLAP.

COFFEE POT.

APrLIoATIoN FILED M1144, 1907.

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A TTORNE YS WHL-VE l locking device.

JOHN S. DUNLAP, OF CHICAGO, ILLINOIS.

COFFEE-POT.

No. 871,492. Q

Speelication of Letters Patent.

Patented Nov. 19, 1907.

'Application filed `lllareh 14. 1907- Serial No. 362.390.

T o all whom it may concern:

Be it known that I, JOHN S. DUNLAP, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Coffee- Pot, of which the following is a specification.

This invention relates to coffee pots or 'urns and has for its principal object to provide a percolating device o simple construction by which a strong infusion of coffee or other material may be made without boiling.

A further object of the invention is to provide a device of this type in which the pot or urn is divided into upper and lower chambers bythe coffee container or percolator, and a single pipe or tube is used through which the boiling water is driven upward from the lower compartment through the coffee, and afterwards is again conducted down from the upper compartment to the lower compartment.

A still further object of the invention is to rovide a device ofthis class in which the insion may be obtained by a double passage .of the boiling water through the coffee wit out, however, inducing the continuous circulation and consequent boiling of the coffee as commonly practlced in devices of this class.

A still further object of the invention is to rovide a percolator which may be firmly ocked within the coffee pot or urn, and easily removedfor cleansing or refilling.

With these and otherl objects in view, as will more fully hereinafter a pear, the invention consists in certain nove features of construction and arran ement of parts, hereinafter fully describe., illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that varlous changes in the form, proportions, size and minor details of the structure may be made without departing from the s irit or sacrificing any of the advanta es o the invention.

In t e accompanying drawings r-Figure 1 is a sectional elevation of a coffee lpot or urn constructed in accordance with the invention. Fig. 2 is a plan view of the percolator illustrating a slight modification. Fig. 4 is a sectional pers ective view of a coffee pot illustrating a rther modification in which lthe valve is omitted. Fig. 5 shows a further modification 'of the means for locking the' percolatorwithin the pot. Fig. 6 is a seetional view illustrating a still further modifi- Fig. 3 is a sectional view cation of the invention. Fig. 7 is an enlarved detail sectional view of the' foraminous disks and filtering aper shown in Fig. 1.

Similar numera s of reference are einployed to indicate corresponding arts throughout the several figures of the rawin s.

n the majority of coee percolators now in use the water circulates continuously through the percolating chamber, being driven upward generally to a point above the coffee container, and. then passing by gravity through the coffee to the lower chamber where, being again heated, it rises to the upper chamber, the circulation being practically continuous.

In the present case one of the principal object is to avoid this continuous circulation and boiling of the coffee and to obtain an infusion by a double passage of the water through the ground or powdered cofl'ee. In the drawings the pot or urn 1() may be of any desired shape and size, and may, if necessary, be provided with suitable heating appliances, especially where the device is used in hotels or restaurants.

At the center of the pot is an inwardly eX- tending flange 15 which forms a seat for a cylindrical casing 16 having a tapered bottom 17. At the central portion of the boff tom 17 is a threaded boss in which is screwed a pipe 18, the lower end of the pipe being adjacent to the bottom of the pot, sothat pracythe like, and between each pair of metal disks is preferably interposed a disk of Eltering paper 20', the coffee being packed between the pairs of disks, as shown. 'lhe upper disk is held down in place by a short tube 22, the periphery of which is threaded and screws through an opening formed in a cross bar 23. The opposite ends of the cross bar are provided with notches 24 for the reception of shouldered lugs 25 that are carried by the flange 15, and these lugs are engaged by cam levers 27 that are pivoted en the cross bar 23, and by turning these cani levers, the bar may be locked down and the upper percolator disk confined in place. The top of the tube 22'is closed by a plug 29 which may, .if necessary, be formed integral with said l lthe opening formed by the flange, and all of the water passing upward through the tube will be compelledv to pass out through the perforations 33 formed below the valve seat,

the water vpassing into the casing 16 at apolnt below `the lowermost ofthe percolator disks, and thence passingupwar'd through.

the coffee in the manner indicated by the arrow in Fig. 1. At the top of the 'tube 18 is an inwardly extending annular flange 34 forming a somewhat contracted opening to permit the passage of any water which may rise with sufficient force to unseat the valve 32, but unless the temperature is abnormally high no water will pass beyond the valve. e

Thevalve acts asa retarding means for preventing the upward passage of water until its'`- temperature has been raised in the lower chamber to a 'point most suitable for the purpose of making the infusion. If, however, 'there is an abnormally high tempera# ture, the water will pass rapidly upward and will unseat the valve, and 1n such case must pass over the top of the tube 18 and down through the tube 22 to a point within the coee chamber.

In practice, coffee is placed between the disks 20 and 21, and water is placed in the lower chamber, after which the lower part of the apparatus is heated in any suitable manner. As soon as steam begins to form and accumulate around the tube 18 and casing 16, the waterwill be forced' upward through said tube and after passing through the 'coffee, will be held in the upper chamber by the pressure of steam in the lower chamber. The 'temperature in the lower chamber is then reduced either by removing the pot from the stove or by the application of any coolingmeans, and as the steam in the lower chamber condenses, a partial vacuum is formed which allows the partial infusion in lthe upper chamber `to again pass down through the coffee, and through the tube 18 to the lower chamber.

When the pot is tilted valve 32 will be unseated, and equalization of pressures in the upper and lower chambers may-readily take place. Inasmuch as the valve is frusto-conical in form, and nearly.

the same diameter as `the tube 18, it will rock back'to seating position-as soon as the pot is replaced in the' horizontal position.

The upper tube 22 forms a convenient means for the removal of the upper bar 23 as soon asthe levers 27 are moved to release position, and this bar and tube may thenbe for pouring, the Y lifted out, while the casing 16, tubel 18 and percolator as a whole may be readily withdrawn by grasping the upper part of said tube 18. 4 A

In the constructlon shown 1n Flg.- 4, the

valve 32 is conical in form, and that portion of the tube'between the bottom 17 and the percolator disk 20 is omitted in order to permit greater freedom of iiow of the water.

In the construction shown in Fig. 4, the percolator casing 16a is provided with a pair of outwardly extending.v lugs 40 -which may be-passed through notches 4l formed in av flange 42 after which the casing may be turned and thus locked in place. In this in stance the valve has been omitted 'and the operation otherwiseV remains the same as Vthat previously described, the water being forced `upward through the tube 18 and being held in the upper chamber by the pressure of steam in the lower chamber until after the temperature of such lowerchamber has been reduced.

As a further-modiiication ofV the percolator, A l

holding means, the tube 18EL may be threaded at its lower end, as 'shown in Fig. 5 and screwed into a stationary nut 44 secured toy the bottom of the pot or urn.

In Fig. 6 is illustrated aconstructio'n in which the lower tube 18b is of much larger diameter than that shown in the remaining gures, and the upper percolator disk is held in place by a small screw 45 passing through the locking ba'r 23.

In practice it will, Vof course, be necessary to stop or plug the pouring spout, and any suitable provision'may be made -for this, the

spout belng stopped by means of a removable Y the sole passage for the water and infusion from' the lower to the upper chamber,`and vice versa. l y

2. A coee pot or urn having an inwardly extendin iange, a. detachable percolator supporte by the ilange and. having a closed bottom which inconnection with said flange divides the pot into u per and lower chambers, a tube pendent percolator and forming the sole assage for the liquid in both directions, and) means for locking the percolator to said flange.

' y3. A colee pot or urn having an inwardly extending iiange, a percolator casing supported thereby and having a tapered bottom,

om the casing of the an open ended tube extending through said tapered bottom, a valve seat above the taperedbottoni, a tapered valve mounted on the seat, a pair of foraniinous disks for confining the coffee in the casing, a threaded tube bearing against the upper disk, a locking bar havinvr a threaded opening for the reception of said` threaded tube, said bar h aving notched ends, lugs projecting from the flange and entering the notches, and cani levers pivoted to .the locking bar and arranged to fit under said lugs.

tending flange, a percolator casing supported thereby and having a tapered bottom, an

.op'en ended tubedepending from the tapered bottom of the percolator casing, a valve seated above the tapered bottom, a plurality of pairs of foraminous disks for confining the cofl`ee in the easing, a filtering disk interposed between each pair of foraminoiis disks, aiul means for locking the pereolatorcasing inA engagement with the flange.

6. A coffee pot including a percolator casing having a tubedependingfroin the bottom thereof, a plurality of'- pairs of foraniinous disks disposed within the casing for confining the co'ee in said easing, a filtering disk interposed between eacli air of foranimous disks, avalvc arranged wit iin the easing above the tube, means for locking the easing Within the coffee pot, and a housing piercing the locking means for bearing against the upper foraininous disk of the adjacent pair for retaining the coffee within the casing.

7. A coffee pot having an inwardly extending fiange, a percolator casing supported thereby and having a tapered bottom, a tube depending from said bottom, a pluralityr of pairs of foraniinous disks arran ed within the casing for confining the coffee 1n said casing, a filtering disk interposed between each pair of foraininous disks, a tube piercing said disk and provided with a valve seat, a valve engaging the valve seat, a locking bar extending transversely across the pot and bearing against the flange, means for locking the bar in engagement with the flan e, and a housing for the valve tube having its oWer end threaded on the locking bar and provided with terniinal teeth adapted to bear against one of the adjacent pair of foraminous disks.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two Witnesses.

JOHN S. DUNLAP. I/Vitnesses:

A. E. OLSON, E. L. Woon. 

